Adjustable chair



FIG. 1 is a front perspective view of an adjustable chair showing our design;

FIG. 2 is a bottom plan view;

FIG. 3 is a side perspective view;

FIG. 4 is a rear perspective view; and

FIG. 5 is a side perspective view wherein the chair is adjusted to an alternate position. 

The ornamental design for an adjustable chair, as shown and described. 